Improvement in printing-ink



i To all whom it may concern oils and varnishes of the'commercial inks.

scones W. OASILEAR, OF-WASHINGTONQDISTRIOT OF COLUMBIA.

Letters Patent No. 104,554, dated June 21, 1870.

IMPROVEMENT m PRINTING-INK The Schedule referred to in these Letters Patent and making partof the same.

Be it known that I,- GEORGE W. GASILEAR, of Vashingto'n, Districtof Columbia, have invented an Improvement in Printing-Inks, of which the following is a full, clear, and exact description, sufficient to enable persons skilled in the art to make and use the same.

The object of my inven'tibn is to produce an ink for printing alone or in conjunction with embossingfrom steel plates and other printing media, or by surfaceprinting from the white line of geometrical lathe or cycloidal work upon ordinary printed checks, stamps, or other securities, using'for that purposeahighly sensitive ink, to prevent washing, alteratiomor photographing; and p lhenature of my invention consists in incorporating with. the ordinary coloring materials or pigments employed in manufacturing inks, a vehicle, which, while it prevents theinks from drying in an insoluble or permanent form, as is the casewith the ordinary printing inks used for surface and-plate-printing, yet,

at the same time, will permit it to dry so far as to lose all gummy or sticky nature inconsistent with'the ordinary use of the stamps, checks, or other securities printed therewith, and yet be readily soluble and penetrable by acids and chemicals such as are used in washing stamps, erasing or altering values upon checks, bonds,-8tc., and, further, to unite with these qualities that degree oftackiness while inking the plate or form so essential in the mechanical processof printing.

Many efforts have been made heretofore, but with veryunsatisfactory results, to produce the first-men tioned quality of drying in a'soluble form by using the various. soluble gums as substitutes for theseveral.

Such inks have, however, been found to be defective in their a working qualities, owing to their want of tackiness or strength, and a tendencyto dry and clog up the plates or types in the process of rolling the ink over the plate or form, while, on the other hand, in the attempt to use glyccrine, honey,0r' other saccharine or hygroscopic substances, to prevent such premature drying and intractability, an ink is produced which leaves the print itself in such a gummy or semi-fluid condition as to be readily smeared, blurred, or defaced by ordi nary handling or by the temperature and moisture of the atmosphere. To correct these evils, I have, by continued experiments, discovered that by combining the glycerinewith the patent drier of commerce in connection with.

boiled'molasses,to give the compound a tacky'nature,

I obtain a vehicle in which the ingredientsmutually correct the defects of each other, the boiled molasses giving great strength and tenacity tothe composition, the-drier overcoming the disposition of the glyeeri'ue to remain gummyand sticky after printing, and the glycerine preventing thedrier from rendenfngthe impression 'fi'om becoming so .fixed and permanent as to be insoluble and impervious to the action'of certain fluids, acids, and chemicals, such as are used for removing the inks used for cancellation from stamps and other papers of value.

work tint, when such fraudulent attempts are made, thus efi'ectually preventing the alteration of bonds and checks and the washing off of cancellation marks from,

internal revenue and postage stamps, that the same may not be used and re-nsed, to the detriment of both \Vitnesses:

FRANCIS TOUMEY, DAVID M. COOPER.

This soluble quality insures v the disfiguring and destroying of the design or ground- 4 

